Isolation of 3-isopropyl-2,1,3-benzothiadiazin-4-one-2,2-dioxide

Details Isolation of 3-isopropyl-2,1,3-benzothiadiazin-4-one-2,2-dioxide Isolation of 3-isopropyl-2,1,3-benzothiadiazin-4-one-2,2-dioxide

1982-10-14

1984-05-29

Hruskoci, Peter A.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210737, 210909, 544 11, C02F 154

Patent

active

044513780

ABSTRACT:
3-Isopropyl-2,1,3-benzothiadiazin-4-one-2,2-dioxide (bentazone) is isolated from waste water, originating from its preparation and working up, by treating the waste water with an acid to bring the pH initially to 7.5-9.5, adding 0.2-0.5% by volume, based on the waste water, of a 40-60 percent strength by weight aqueous bentazone salt solution and heating the mixture for 15-30 minutes at 75.degree.-110.degree. C. The solution thus treated is then cooled and brought to pH 1-3 with a mineral acid, whereupon the bentazone precipitates in a form which can be filtered off.

REFERENCES:
patent: 4284516 (1981-08-01), Parker et al.
patent: 4382865 (1983-05-01), Sweeny

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